Does your dongle driver installation rollback?

Over recent years an issue has arisen where a user has problems installing the Sentinel drivers for the security key (dongle). The installation gets about 60% of the way through and then stops and de installs itself. This prevents a user from licensing CADSTAR.

Generally the reason for this is that the driver installation does a port check and detects that the port that it uses is already in use so rather than create a conflict it will stop and rewind the installation.